Stop motion mechanism for die presses



June 25, 1946. J. SIMPSON 2,402,687

STOP MOTION MECHANISM FOR DIE PRESSES Filed June 12, 1944 3 Sheets-Sheet l IN VEN TOR.

Jusfiz'w 5623 050274 June 25, 1946. J. SIMPSON STOP MOTION MECHANISM FOR DIE PRESSES Fild June 12, 1944 3 Sheets-Sheet 2 llll ll NE ENTOR.

IIFH H Illll lllllll June 25, 1946. J. SIMPSON STOP MOTION MECHANISM FOR DIE PRESSES Filed June 12, 1944 5 Sheets-Sheet 3 uymvron. 501 050774 Patented June 25, 1946 UNITED STOP MOTION MECHANISM FOR DIE PRESSES Justin Simpson, Elmhurst, Ill.,

assignor to Cameron Can Machinery Company, Chicago, 111., a corporation of Illinois Application J une 12, 1944, Serial No. 539,809

This invention relates to stop motion mechanisms capable of use on a variety of high speed machines, but particularly adapted for and here illustrated in connection with a high speed automatic die press.

7 One of the essentials of a stop motion mechanism when used on presses of this character is that it be adapted to bring the press to rest in a predetermined position with the movable die elevated so that access to both the movable and stationary dies may be readily had. A mecha: nism for this purpose is disclosed in Patent No. 2,330,555, issued to Cameron September 28, 1943.

' The mechanism in that patent embodied a brake and a clutch of the clutch-pin type, the clutch and brake being so timed that the pres would 6 Claims. (Cl. 192144) be brought to rest in predetermined position and with the minimum of shock and jar.

My present invention constitutes an improvement upon the mechanism of the aforesaid patent in that the shocks and jars inherent in the employment of a clutch pin type of clutch, even when such clutch operates at its best, are entirely eliminated. This result is attained by employment of a friction clutch instead of a clutch-pin vention;

Fig. 2 is a fragmentary elevation partially in section and looking toward the right in the direction of the arrow on Fig. 1;

Fig. 3 is a sectional view on the line 33 of Fig.2; and

Fig. 4 is a rear elevation of the clutch side of the machine looking at Fig. 3 substantially on the line 4-4.

Referring to the drawings more in detail, reference character 5 indicates the body of the machine which is supported upon the base 6 and carries the main shaft 1. A stationary die 8 is mounted on the frame, and a movable die, not shown, is reciprocal toward and from the stationary die by the connecting rod 9 which is connected at its upper end'to the crank II formed intermediate the ends of the shaft I. The shaft is journaled in bearings I2 and I3 and is equipped at one end with a driving clutch and at its other end with a brake, both of which will be later more fully described- From Fig. 2 it will be observed that a cylindrical hub I4 is keyed to the shaft near one end by the spline key I5 and is shaped to provide an external clutch disc I6 secured to and preferably formed integrally with the hub I4. Upon the cylindrical hub I4 there is rotatably mounted the hub Il of a driving clutch disc I8 formed at its perimeter to serve as a flywheel and also as a driving wheel, which in the present instance is shown as being grooved on its periphery, as indicated at I9, for the reception of driving V-belts 2I.

A second external clutch disc 22 is formed upon one end of a clutch sleeve 23 rotatably mounted :upon the shaft I and slidably connected by splines 24 seated in grooves 25 to a ring 26 which is fixedly attached to an annular shoulder 21 formed on the shaft I in close proximity to the bearing I3. A coiled expansion spring 28 interposed between the outer face of shoulder 21 and the bottom of a groove 29 formed in the clutch sleeve 23, normally urges the sleeve and clutch disc 22 toward the right viewing Fig. 2 into clutching relation with the driving disc I8. Discs 3| and 32 of clutch lining material are interposed between the faces of the driving disc I8 and the driven discs I6 and 22, respectively. A peripheral groove33 formed in the rin 26 is designed to receive a V-belt 34 by which the scrap, feed and delivery rolls (not shown) are driven.

Hub 23 of the disc 22 is also provided with a peripheral groove 35 in which a pair of shoes 36 carried by the respective arms of a yoke 31 are slidably disposed. The hub 38 of this yoke is fulcrumed on a pintle 39 carried in bearings 4| formed on the frame of the machine. The depending arm 42 of this yoke is connected at its lower end by a pin 43 with a link 44 pivotally connected by a pin 45 with a similar link 46 pivoted at 41 to the machine frame, the links 44 and 46 together forming a toggle by which the yoke 42 is moved counter-clockwise on its pintle 39 to withdraw clutch disc 22 from the driving disc I8 against the force of spring 28 when the toggle is straightened or, in other words, when the pin 45 is moved upwardly into alignment with pins 43 and 41. A yoke 48 straddling links 44 and 46 and engaged with pin 45 is connected with a link 49 which is adiustably connected with a bifurcated head 5|, which in turn is connected by a pin 52 with the lateral arm of a bell-crank lever 53 shaft 54 there is rotatably mounted a bell-crank 5 lever consisting of a downwardly extending abutment arm -59 provided with abutment shoulder SLand' aH upwardly extendingiarm fiztprovided with a cam follower 63 which is retained in cooperative relation with a cam 64 by means of a tractile spring 55 attached at one end to the arm 59 and at its other to the frame'5.

The press is provided with a starting handle 66 pivoted on the frame at fil andadapted to :be

the weight of the upper die and connecting rod when the press is stopped, I have provided means for manually actuating the rockshaft 54 and the parts connected therewith. This means consists of the previously mentioned link 51 connected at one end to the bolt 55 and pivotally connected --at-its-.other. end.by a .pin9l withiaicam head 92 provided"wit'h a'hand -lever. 93. YIhe link projects through an opening 94 in a bracket 95 projecting from the main frame of the machine. It will be apparent that swinging movement of the lever 83 upon its pivot 9| in a counter-clockwise direction viewing Fig. 3 will pull the link 51 to the left,.thereby rocking the lever 53, the rockshaft retained in the starting :andtrunning ;position e54'tandlthe arm .81 in a clockwise direction to exemplified in full lines in Fig. 1, by electromagnetic means controlled by anlelectriccircuit or circuits including suitable stop switches by which closed inpriorPatentNo. 2.330,555.previously. referred to, or may be of modified form tosuit the requirements of anyparticular installation, as is .25

well. known in the art. The operating-endofthe .handleGB is .connected by a link'68,-'.pref.erab1y including .an adjustable turnbuckle. 59, with the head'll of the pivoted dogf5.8,. said-head being sapp-ly the brake and release the clutch.

Duringnormaloperation of the press the disc flywheel l8 is'driven from any suitable source of gagementwith the .driving .disc l8.by thezspring 28, and thebrakeis held in ofi,.position-by.the arm '31, all as shown in the drawings. .Upon release of the handle 66 by eithermanual manipulation or through the occurrenceofanabnormality in the operationof the. press, the handle assumesthe dotted line, position. shown in. Figtl,

pivetally. connected .torthe. dog by pivot .pinflZ. .3 thereby elevating thedog 58 .into thepath of. the

. Anexpansion spring. l3i interposed between said .head. and ashoulder'il lbn the. link-88 affords a yieldable connection which, prevents. injuryto-the ,parts in the. event the. arm '59 .shou1d be disposed .in the path ofthedog .58 when anupward thrust 85 is exerted thereon.

The left-hand endof the; shaft 1 is equipped,

. aspreviously; mentioned, witha brake which may .be .of any desiredconstruction, butpreferably is or the.typeillustrated in previously mentioned All) .PatentNo. 2,330,555. vThe detailsof the .brake structure need nothere be explained in detail, .butit will be suflicienttostate that within the stationar .brake drum .15 .thereis disposed an expansible brakeband oiy s hoe dapted to be. e .45 the. cam.followerfilrides Gfi the highportionof vpande'ol into braking engagement with thecdrum when the-stuhshaft 16 .(upon the-inner endof which the brake expandingdevice is.mounted) ..is.partially rotated in. a CIOGKWiSGLdlIYGCtlOH view- .ing. Fig. 3.

spring I1 interposedhetween. a. bracket-r18 on-the frame-of the machine andanadjustable.abut- ..mentile mounted upon..a..rod BI .connectedlbya pin '82 to an .armt83 adjustablya connected with shaft l6=.by.a.bolttandslot;connection='84. 'The lowermend of rod .8l is, equipped .with aneadjust- .able abutment 85,..and =an-eye r slidably :dis- .posed upon that portion. of the. rodlsbeneathzthe bracket 18 is connected with; an; arm :81 which". is

fixe'd upon the .end portion. ofshaft- 54 ,extendingcfl0 transversely of the machine, .as Willa-be apparent from Fig.2. Atractilerspring .88'.( F- ig,-.32,-con- .neetedwith .bolt 56 and. apest-.89: en'tthe'. frame5,

normally holds the shafts-54 1 with .the eleven arm ,B'I and .the bell-crankwlever r53. fixedzthereon in ..theposition shown in .Fig...3;-soithatiarm 81. holds the .brake rod 8! :dow-nawiththe brakeband'in inoperative .relation .to the surrounding Jbrake drum. When shaft 54. is. moved. in a-clockwise shaft 1. a I

.In order that the brakemay rbewappliedeand abutment shoulder 6| onthelever arm 59. 'When the high portion of the cam. 54. engages-thefollower 63,.r.oclzing the lever-arm =62. inaclockwise direction viewing Fig.3, the shoulder-Nil pushes .the. abutment dogl58-to the left, thereby rocking .arm 81, thereby, permittingthe spring .11 .to .-apply the brake soaslte bring the shaft'l-to astop.

lThe stopping of. the press isthus efiectedbefore the cam 54, .inwhichpositionof the shaftlthe upper die is; in. elevated. position. .When it .isdesired-tostart the ,press again,...the,.handle 66 is Imanually raised .to running .positioh, thereby This .movement is imparted .by :a1-

withdrawing the doglliiainom..the...shoulderL61,

v thus permitting .the '.brake -to. be released 1' under .the influence of .spring..88 .a'nd,..the-clutch to ;be engaged bythe spring 25.

"In'the eventlthat in :workingupon the-, pressrit should be desirable te-turnit by: hand .-to...a.point where the high part ..of .the cam. 64 .would pass beyond the. follower $63,..theshaft. I may belocked against rotation under the weight of the :upper .die by-simply swinging thehandlever 5-3::in a .countemclock-Wise idirection, .viewing .Fig. :3, ..to thereby manually applytthelbrake in-the-Inanner previouslyidescribed.

While I have "shown and described zatpr e'ferred embodiment of. my. invention, it. should her-manifest that thestructural detailscillustrated.anddescribed may be varied Within considerablenlimits without. departing from the, essence ef.-:my%;-inven .-tion-..as defined in' theifollowing. claims- .-.-I claim:

.1. The combination. withwiadie: press izincluding a: main :;s'haft,:=.a friction1driving iclut'chitherefor,

abrake therefor :anda start rand'szstopzhan'dlauof a1rockshaft' extending cpara'llel with. said zshaftp a 1 clutch controlling lever-:andsa :zbra'ke :contrh'liing retainedto holdt-he shaft ins rotation fin r 'rarm fixed onrsaidzrockshaftin spacedsapartfreiation, a cam on said main shaft, a lever operable by said cam and provided with an abutment shoulder, a thrust dog connected to move said rockshaft under the influence of said abutment shoulder, a connection between said thrust dog and said start and stop handle for moving said thrust dog into and out of cooperative relation with said abutment shoulder and an operating connection between said clutch controlling lever and said clutch including a clutch shifting yoke, a pair of pivotally connected toggle links interposed between said yoke and a stationary point on the press and an operating link connecting said toggle links with said clutch controlling lever.

2. The combination with a die press or the like including a main shaft, a clutch and a brake therefor, of a rockshaft, means operable by said shaft for actuating said clutch and brake, a manually operable means for rocking said shaft, and manually controlled means including a cam actuated lever, a thrust dog and a start and stop handle connected with said dog for operating said rockshaft under the control of said handle.

3. The combination with a die press including a main shaft, a brake and a clutch therefor, and a start and stop handle, of a rockshaft, operative connections between said shaft and said brake and clutch, manually controlled means including a manually operable cam for rocking said shaft, and automatically operable means for operating said shaft, including a cam, a lever provided with an abutment shoulder, a thrust dog and a connection between said dog and said handle whereby the dog may be positioned in and withdrawn from the path of movement of said shoulder.

4. The combination with a die press or the like having a main shaft, a friction driving clutch positioned near one end of said shaft and a brak for said shaft positioned near the other end thereof, of a rockshaft extending parallel with said main shaft, a cam on said main shaft, an oscillatory lever operable by said cam and provided with a thrust shoulder, a clutch controlling lever fixed on said shaft, a thrust dog pivoted on said clutch controlling lever, means for positioning said dog in the path of said shoulder to thereby cause said rockshaft to be actuated from said cam, a brake controlling arm fixed on said rockshaft, brake actuating mechanism controlled by said arm, a clutch shifting yoke, and a connection between and yoke and said clutch controlling lever including a toggle and an operating link connected with said lever whereby said clutch is released upon actuation of said rockshaft.

5. The combination in a stop motion mechanism for die presses and the like including a main shaft, a friction driving clutch and a brake therefor, of a rockshaft, a cam on said main shaft, a lever fulcrumed on the rockshaft to be actuated from said cam, an abutment shoulder carried by said lever, a clutch controlling lever fixed on said rockshaft, a thrust dog pivoted on said last mentioned lever, means for positioning said dog in the path of said shoulder, a link connected with one arm of said clutch controlling lever, a toggle connected to be actuated by said link, a yoke lever for shifting said clutch under the influence of said toggle, a brake controlling arm fixed on said rockshaft, a spring actuated brake rod, and a lost motion connection between said rod and said last mentioned arm.

6. The combination with a die press or the like including a main shaft, a clutch and a brake therefor, and a cam on said shaft, of a rockshaft disposed parallel with the main shaft, a lever fulcrumed on said rockshaft and adapted to be operated by said cam, a shoulder carried by said lever, a clutch controlling lever fixed on said rockshaft, a thrust dog pivoted on said clutch controlling lever, means for positioning said dog in the path of said shoulder, a clutch shifting yoke, means including a, link and a to gle connecting said yoke to said clutch controlling lever whereby said yoke is actuated, a brake controlling arm fixed on said rockshaft, a brake operating rod, a lost motion connection between said rod and said arm, and manually operable means for actuating said rockshaft.

JUSTIN SIMPSON. 

